EP 0462340 A1 19911227 - Direct current motor.
Title (en)
Direct current motor.
Title (de)
Gleichstrommotor.
Title (fr)
Moteur à courant continu.
Publication
Application
Priority
US 26323588 A 19881027
Abstract (en)
A direct current machine construction in which the rotor includes a permanent magnet (10) with the stator (50) including field winding energizable from a direct current source. In a first embodiment first and second stationary slip rings (26,27) are connected to an external direct current source. Coupled for rotation with the shaft are to first and second brush assemblies with brushes (18,20) which are spring biased and protrude radially outwardly from the rotor shaft (12). The commutator for the field windings is stationary relative to the housing and includes a plurality of commutator segments (32) positioned intermediate the slip rings (26,27) and in a cylindrical manner facing inwardly toward, and for contact with, the commutator brushes (18,20). The field windings are on the stator (50) with the winding leads windings being accessible externally of the stator for enabling switching devices to be utilized for changing of the number of turns of the stator windings for thereby varying the motor characteristics, as needed. The switching devices may be mechanical switch devices or static semiconductor switch devices. In a second embodiment, commutation is effected by non-contact position sensing devices, such as encoder wheels, optical devices and the like, operable in response to a rotating device keyed to the rotor shaft, which device is positioned for electromagnetic accuracy relative to the pole positions of the stator of the machine. Other embodiments are disclosed. With accessible external leads, the machine may be alternately used as both a propulsion motor and generator in the same device for returning power to the direct current source. <IMAGE>
IPC 1-7
IPC 8 full level
H02K 23/62 (2006.01); H02K 25/00 (2006.01); H02K 29/06 (2006.01)
CPC (source: EP US)
H02K 23/62 (2013.01 - EP US); H02K 25/00 (2013.01 - EP US); H02K 29/06 (2013.01 - EP US)
Citation (search report)
- [X] FR 2371797 A1 19780616 - ARTUS [FR]
- [X] DE 3320555 A1 19841213 - STEGMANN UHREN ELEKTRO [DE]
- [X] FR 1457668 A 19660124 - CSF
- [X] DE 2258361 A1 19730530 - MITSUMI ELECTRIC CO LTD [JP], et al
- [X] GB 1048471 A 19661116 - SECR AVIATION
- [A] FR 2365908 A1 19780421 - ANVAR [FR]
- [A] DE 2822566 A1 19791129 - ROTTMERHUSEN HANS HERMANN
- [A] AT 251096 B 19661212 - PHILIPS NV [NL]
- [A] US 3257594 A 19660621 - WEIGEL ROBERT M
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
US 26323588 A 19881027; EP 90306803 A 19900621